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　　1.Although plant and animal species that become established in ecosystems where they did not originate are sometimes referred to by the alarming term “invasive species,” many such species are ________in their new environments.

　　A：innocuous

　　B：conspicuous

　　C：robust

　　D：menacing

　　E：distinctive

　　答案：A

　　2.Far from being ________ the corporate world because of cutbacks, serious researchers are playing a growing role in innovation at many firms.

　　A：lured to

　　B：enchanted with

　　C：banished from

　　D：protected by

　　E：immured in

　　答案：C

　　3.The unexplained digressions into the finer points of quantum electrodynamics are so ________ that even readers with a physics degree would be wise to keep a textbook handy to make sense of them.

　　A：uninteresting

　　B：controversial

　　C：unsophisticated

　　D：frustrating

　　E：humorless

　　答案：D

　　4.Even the charisma and technical prowess of two fine actors are not ________the task of fully invigorating a gray domestic drama with a tired tale to tell.

　　A：required for

　　B：interested in

　　C：prepared for

　　D：adequate to

　　E：inferior to

　　答案：D

　　5.There may be a threshold below which blood pressure reductions become ________given that a long-running study showed no decreased heart risk for drops in blood pressure below a certain point.

　　A：worthwhile

　　B：indiscernible

　　C：arduous

　　D：significant

　　E：superfluous

　　答案：E

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